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From "Jitendra Nath Pandey (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-2904) HA: Client support for getting delegation tokens to an HA cluster
Date Thu, 23 Feb 2012 20:40:49 GMT

    [ https://issues.apache.org/jira/browse/HDFS-2904?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13215029#comment-13215029

Jitendra Nath Pandey commented on HDFS-2904:

# bq. public static boolean isLogicalUri(..)
I think we should not couple the idea of logical uri with the failover proxy configuration.
For example, someone might want to turnoff ha and not provide failover proxy configurations,
but the logical URIs should continue to work.
# In the cloneDelegationTokenForLogicalUri, should we clone one more token for the standby
as well for ha configurations? 
# I think it is a good idea to clone a token for a logical service, to multiple tokens with
underlying service addresses. We should have it irrespective of the failover proxy configuration
i.e. whenever we have a logical uri, we map it to actual service addresses and clone token
for each.
> HA: Client support for getting delegation tokens to an HA cluster
> -----------------------------------------------------------------
>                 Key: HDFS-2904
>                 URL: https://issues.apache.org/jira/browse/HDFS-2904
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: ha, hdfs client, name-node, security
>    Affects Versions: HA branch (HDFS-1623)
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>            Priority: Critical
>         Attachments: hdfs-2904.txt, hdfs-2904.txt, hdfs-2904.txt, test-dt.sh
> Currently we have server-side support for delegation tokens in HA, and some tests to
verify it, but the client throws NPEs when trying to fetch a DT. This is because the cluster
doesn't have a single hostname, but instead a logical nameservice name.

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